Automatic cutoff and relief valve for tires



INVENToR.

I-IIIIIIIIHH I 'A525 mun C/L/us Hua/E14 J. A. PINCHEV AUTOMATIC CUTOFF AND RELIEF VALVE FOR TIRES Filed March 5, 1946 Sept. 23, 1952 Patented Sept. 23, 1952 OMATIC oU'roFF AND RELIEF FOR TIRES VAL-vn I Y l`llflilisA,ll'finclliev, Los Angeles, l l Applicator; Merche, 1ere-*serial Noiesziora S51 Y j This invention relates to tire gauges. f @It isjan objectrof this invention torfprovid'e an improved .tire gauge by means of which apne'uf vide 'anfaocurate gauge of the l'character described 1 which is adjustablevfor providing the desired in- `nation pressure orthe pressurebest suited tothe particular tire. 1 Y. i

`It is another 'object of this invention to .prov4 'video tire gauge such as de'se'zi'ribed Awhich when `applied t'o a tire -havinga pressure in excessief-a predetermined pressure to which the Ygauge is set,A will :cause the excessive 'ainp'ressure to-be automatically released-tothe atmosphere and lthe predetermined pressure Sto be maintained 1 in thetire. w f Y Referringfto the drawings:v ,Figi -1 is 3,- -side elevatiiiioan air gauge embedyiiig the prsent-inventionj Y1 EF1@ -2 -i' a teppla View lokig-frmthe=pla1 "'ef line-'2462 f'igl; l Figa-3 -ls 2an*enlargedl Ve taken on line 3-3 offFig, u

f4 ia' J'horizontal seetionl :View on a redue scale taken 'nlinl-eofflig. 3V; Fig; 5 sa horizontm seeuoriawiew snai-e: `d'u'zed scade tak'ei'rfon"line5I eflig: 3; "and` Fig. Vfis fa ragmentarysectio-n'a View takeneon lll'e G- F. 3. 'l Il shown Ain' the accompanying drawings,l "ain adjustable *gauge embodying the present invention and `'generally designated 'I is `'adrfi'ptedrto' be eonnected Witha compressed air supply line fv ieal sectional View 'andthe-*usual flexible hose`-3 vhearing a lconve'n- "The gauge I V-inczludes'afc'z'x'linder '-5 and 2a piston 6 fomingf-bet'wen the piston Aand; the cylinder head V.'I, n-expansible Vehau'nber f8; In 'thefwall I of this cylinder, i's a, fluid passage 9-which is emlr'cated tllough iafpert I-l- With the 'Cham-- berf', and communicatecib-y.meansora-'port I2 with "a nipple /I3fte1which`the-iflexiblehose 3 .is connected. -V

Air under pressure from the supply linevZLen--h1 ters vangintakeport I4 in the.,botto-ml wall l5ro-f the cylindeni, .and passes 'through ra restricted passage Iinsaid bottom walLinto :thefiuid pas Sage-9,. je# i. AVV v v i Claims; Chiller-'212W g l :Valve means ITI is providedto control the now .of air through the vpassage I5' alsothe 110W Aof airthrough 'an outlet port I8 Whifhleads from Y passage AI6 to, the exteriorof the bottom wall yl* 5,

for Venting air tothe atmosphere in the event of 'excessive ination of aitire,

As here shown the valve means I 'I inc '1udes a valve closure member 2 0slidab1e in av bore `2| intersecting the passage I6 andport iIfin the bottomY wall- I5. 'Axially spaced on the valve member are through ports 22 and A23 yadapted to be, brought into registration with the passage I6 'andpofrt I8, respectively, according toI the positionlof the valve member 25. The port 23 Vis ll sl1aped sol as to communicate the passage I6 with' the outlet port IB while thevalve kmember is in position to shut off thesupply of air from thepline 2.

The valve `member 29 is maintained in position closing the passage I6 andport |18 as shown inFig. g3, byfmeans of a spring 2 4.v One end of `this springis ysecured as at 25 ina recess 26 in -the ybottom wall |5. The other end. of the springis secured as at-2 'I to an arm; 28'extending laterally vfrom the upper end oflrthe valve member 20. Y u

Means providedforqmanually moving ythe valvemember 20 upwardly toregifs'terftheport rounded endl33f off the valve member 2i) toinove `theflatter intopositionto openpassage' I Ieigainst the Iforcel or v-the spring .24. Y Howeve the bei is biasedby an off-center" spring means'll sof that :after it is operatedY toopen'thefvalye" Vinertiber 52h, Will remain in positionwithfthe at one lend ias at l to theexterior of cylinder 5., VA latchemember 3vI is carried enftheother;-

opening as in the wall.; 0f the. cylinder 5 the;valve memberis moved upward-ly o -o'pen passage I6, a f bevelled l endy portierik j upper end ofthe valve member encounters-the 3 latch member 31 which then yields outwardly and then snaps under the end portion 39, thereby holding the valve member in open position.

As shown in Fig. 3, a coil spring is connected with the piston 6 and piston adjusting means 4I so as to resist movement of the piston in a direction for releasing the latch member 31. One reduced end of the spring 40 is secured as at 42 to the piston while the other reduced end is secured by clamp means 43 to a follower member 44. the chamber 8 and forms a part of the means 4l, being cut away as at 45 to permit air to be effec;- tive beneath it against the piston.

The piston adjusting means 4l includes a screw threaded rod 46 rotatably journalled in the cylinder head 1 and threadedly engaged in a screw threaded opening 41 in the follower member 44, whereby on turning of the screw threaded rod as by means of the handle 48 on the upper end thereof, the pistonl 3 will be' raised or lowered depending upon direction of rotation of therod. This arrangement provides. for setting the piston 6 at different positions in the cylinder 5 according to the inflation pressure desired, it being apparent that if the piston is set a greater distance from the latch 31, a greater pressure will be required to release the latch 31 and allow the valve member 20 to close. Conversely, on setting the piston nearer to the latch member 31, the valve member 20 will be closed at alower pressure. In all instances of the piston moving to cause'the valve 20 to close, the spring 40 yields, thus allowing the necessary piston travel. The piston will return to the predetermined position to which it has been set upon removing the chuck from the tire valve.

'I'he release of the latch member 31 -is effected by the bevelled lower end 49 of the piston-contacting a. cam member 50 arranged on the spring member 35 to extend through an opening 5l into the lower portion of cylinder 5. Upon being contacted by the end 48 of the piston, the cam member 50 causes the member 35 to be moved soas to withdraw the latch member 31 and allow the spring 24 to close the valve member 20. Y n

"Provision is made for automatically relieving air fromA the tire in the event the pressure therein whengthe gauge is applied thereto, is greater than desired or in other words greater than the pressure settingof the gauge. Accordingly, when this excess' pressure is 'encountered the' piston will move'downwardly and push the valve" member 20 downwardly against ,thev action of the spring 24, until the L-shaped port 23 registers passage l5 with outlet ,port I8'. When the-valve is in this position air from vthe-line 2 is-shut 01T but the excess air in the tire will be vented to the 4atmosphere, When the excess pressure isv relieved-the piston will be raised by the spring 40 thereby allowing the spring 24 to move the valve into the closed position shown inFig. 3. i 3;.

A pressure indicating scale 52 is provided on theexterior of thecylinder 5 along the edge of a'vertical groove 53 cut in the cylinder wall. An index A54 is provided on a nut 55 which is threaded on a screw threaded rod 5B rotatably mounted in the, groove 53. Rotation of this screw threaded rodr53 is effectedby means of enmeshe'd gears 51 and 58 on the rods 46 and 'respectively. These rods? are correspondingly 'threaded and the scale 52 is so graduated that on turning the rod-46 to vary the position of the piston 6,` the index 54 will indicate on the scale 52, the pressure setting of the gauge. -1 I This follower member has a sliding fit inv I claim:

1. In an automatic fluid flow control device: means, including a movable element, forming an expansible chamber; means resiliently restraining movement of said element in response to an increase of pressure in said chamber; means for adjusting the force exerted by said restraining means, including a movable member; and a rotatable threaded rod for moving said member; means for indicating the'position of said member including a scale and an indicator member; means for moving said indicator member including a rotatable threaded rod; means forming a `driving connection between said rotatable rods;

means forming a passage adapted to be connected with a closed fluid pressure space, communieating freely with said chamber and including a port; valve means controlling said port, means biasing said valve means to closed position;

manual means for operating said valve to open position; latch means in said chamber for retaining said valve open, and operable tor allow said valve to close, upon movement of said element into contact therewith.

2. In an automatic fluid fiow control device: means including a pressure responsive element forming an expansible chamber; means rforming a passage adapted to be connected with a. closed fluid pressure space and communicatingfreely with said chamber; means forming a fluidinlet port and a fluid outlet port; valve means including a valve member operable to positions respectively connecting said passage with either of said ports, means biasing said valve member to an intermediate position closing Vsaid ports; manual means for operating said valve member to a position connecting saidpassage and one ofl said ports; `latch means forreleasably securing said valve member in said position and operable to 1release said valve member for return to its intermediate position upon movement of said element to va predetermined position, said valve member having an actuating lportion engageable by .Said element upon movement past said predetermined position whereby said element, operates theva1ve member to a position connecting -said Vpassage and the other of said ports. vy 3. InV an automatic fluid owvcontrol device: a cylinder and p iston structure, closed at one end to Vform anexpansible chamber; means forming a passage adapted to be connected with a closed fluid pressure space, communicating vfreely with said chamber and including a port; valve. means including a movable closure` for controlling said port; means urging said closure to closedposition; manual means for moving said closure .to open position; latch means, .comprising a resiliently urged element mounted for movement transverslely of the direction offmovement of' said piston, and means on said closure andfsaid element providing cooperating inclined surfaces adapted to engage upon movement of said closure to open position andycause retraction of said element, said element and said .means havingcoengaging surfaces preventing 4thereafter return movement of said closure; said latch means having a cam surface thereon-'normally in-thegpath of movement of said pistonand engageable by said piston upon a, predetermined movement thereof for moving closure. .Y .f

4. In an automatic fluid flow controlv devicez. a cylinder and piston structure, closedatone end to form an expansible chamber; mea'ns'formingv a passage adapted to be connected with a closedl said element to release ,saidv point for causing said closure to open, and spring means compressed by movement of said member in either direction to opening position and efcomprising a resiliently urged element mounted for movement transversely of the direction of movement of said piston, and means on said clo sure and said element providing cooperating inclined surfaces adapted to engage upon move# ment of said closure to open position and cause retraction of said element, said element and said means having coengaging surfaces preventing thereafter return movement of said closure; said latch means having a cam surface thereon normally in the path of movement of said piston and engageable by said piston upon a predetermined movement thereof for moving said element to release said closure.

5. In an automatic fluid flow control device:`

means forming a passage adapted to be connected with a closed iiuid pressure space; means, including a pressure responsive element, forming an expansible chamber freely communicating with said passage; means forming a iluid inlet port and a fluid outlet port; valve means including a valve member operable to connect said Y passage and either port, means biasing said valve member to a position closing said ports; and manual means for operating said valve member to a position connecting said passage and one `of said ports; said valve member when in port closing position having a portion engageable by said member to a position closing said ports; manual means for operating said valve member to a position connecting said passage and one of said ports; latch means for maintaining said valve member insaid position, and including a cam surface engageable by said pressure responsive element for releasing said valve member; said 'valve member having a portion extending into 'the path of movement of said element for engagement thereby after. release of said latch means, whereby continued movement lof said element operates said valve member to connect said passage and the other of said ports.

7. In an automatic fluid flow control device: means forming a passage adapted to be connected With a closed fluid pressure space; means, including a pressure responsive element, forming an expansible chamber freely communicating with said passage; means forming a fluid inlet port and a fluid outlet port; valve means including a bore and a valve member axially movable therein, said ports and said passage having angularly spaced coplanar openings to said bore; said valve member having axially spaced passages for respectively connecting said passage opening with either of said port openings; means biasing said member to closed position in which said openings into the bore are intermediate the passages in said member; and manual means for operating said valve member to connect said passage with one of said ports; said valve member having an extension for engagement by said element to operate said valve member to connect said passage with the other port in response to movement of said element.

' JULIUS A. PINCHEV.

REFERENCES CITED Y The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,103,474 Blckford July 14, 1914 1,286,119 Sagaser Nov. 26, 1918 1,334,897 Greer et al Mar. 23, 1920 1,461,010 Amdursky July 3, 1923 1,495,553 Durham May 27, 1924 1,699,378 Smith Jan. 15, 1929 1,713,849 McAneny May 21, 1929 1,724,389 Abel July 3, 1929 2,173,369 McElroy Sept. 19, 1939 FOREIGN PATENTS Number Country Date 23,333 Norway May 13, 1913 

